Coordination Polymer Framework Based On-Chip Micro-Supercapacitors with AC Line-Filtering Performance

Abstract

On-chip micro-supercapacitors (MSCs) are important Si-compatible power-source backups for miniaturized electronics. Despite their tremendous advantages, current on-chip MSCs require harsh processing conditions and typically perform like resistors when filtering ripples from alternating current (AC). Herein, we demonstrated a facile layer-by-layer method towards on-chip MSCs based on an azulene-bridged coordination polymer framework (PiCBA). Owing to the good carrier mobility (5×10^-3 cm² V^-1 s^-1 ) of PiCBA, the permanent dipole moment of azulene skeleton, and ultralow band gap of PiCBA, the fabricated MSCs delivered high specific capacitances of up to 34.1 F cm^-3 at 50 mV s^-1 and a high volumetric power density of 1323 W cm^-3 . Most importantly, such MCSs exhibited AC line-filtering performance (-73° at 120 Hz) with a short resistance-capacitance constant of circa 0.83 ms.

Keywords: AC line-filtering; azulene; coordination polymers; layer-by-layer methods; micro-supercapacitors.